ASTM A409/A409M-19 pdf free.Standard Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service. This specification2 covers straight seam or spiral seam electric-fusion-welded, light-wall, austenitic chromium-nickel alloy steel pipe for corrosive or high-temperature service. The sizes covered are NPS 14 to 30 with extra light (Schedule 5S) and light (Schedule 10S) wall thicknesses. Table X1.1 shows the...